Adjustable scaffold hoist



Oct. 19, 1954 L. v. PHILLIPS ADJUSTABLE scAFFoLD HoIsT 4 Sheets-Sheet 2Filed OGt. 19, 1951 @Iwo . INVENTOR. AVER/VE V. P///P5 4v-Tanner Oct 19,1954 1 v. PHILLIPS ADJUSTABLE scAFFoLD HoIsT.

4 Sheets-Sheet 3 Filed Oct. 19, 1951 www..

INVENTOR. AVFNE MPH/LIPS ct. 19, 1954 l.. v. PHILLIPS ADJUSTABLESCAF'FOLD HOIST 4 Sheets-Sheet 4 Filed Oct. 19, 1951 INVENTOR. AVER/vfV- Pff/MP5 Arron/VET 'Patented oci. 19, Y1954 UNITED STATES PATENT(lli'FIfl-LEv ADJUSTABLE scAFEoLD HoIsT Laverne V.V Phillips, Mitchell;S..Dak.

Applicationictolierflil, 1951, f Seriali No. y252,123

1 claim. l

The present inventionrelates Lto. an: adjustable scaioldhoist anditfconsistsinthe combinations', constructions and arrangements ofpartsahereln described and claimed.

Generally there is provided a1pluralityK ofsubstantially rectangularunits` each. having a verticallyv extending leg: member ati each cornerthereofv and the legs. of' each of. the. succeeding units beingtelescoped withinthe-corresponding legs of the unit therebelow;Each'unitis' provided at eachA of its narrower ends with a- Vvshapedbracket which normally extends1below an upper cross' arm of the' unitltherebelowV and is connected therewith by fallswhichiare', invturn;-connected with a centrally disposed. winch= carried by the'lowermostunit. A m'otox'- is: likewise carried by the lowermost unit andi mayv becontrolled from. the uppermost-unit, if? desired, or from any otherconvenientpositiom @ne-of the principal features of theA invention isfthat the various cables emanating froml the falls constituteinthemselves a safety factorl since the accidenta'l' breaking one of' suchcables will still leave the remaining cables in aposition-tc main,- tainthe device in whatever positionin which it then may be.

It is accordinglyl anl object of vthe inventiont'o provide an apparatusofthe character set forth which is exceedingly'sirnplz-rinyconstruction; inexpensive to manufacture, easyto-repairbythose of normalskillv and yet effective and` efficient in use.

Anotherl object of the invention" is the provision ofan apparatus of thecharacter set forthhaving novel means for raisingand loweringthe same;

A further object of the inventionv is the" pro'- vision, in anapparatusioftlie character'set forth; of a novel extensibleladderforming a: partoftlie invention.

Other and further objects ofthe" invention will become apparent from areading of the following specification taken in conjunction withthedrawings, in which:

Figure 1 is a side elevational view of an embodiment of the invention;

Figure 2 is a top plan. view. thereof,

Figure 3 is a sectional. View taken alongv line 3 3 of Figure 1,r

Figure 4.is a sectional view'taken alongl line 4 4 of Figurev2,

Figure 5.is an end elevational' view off the ap- Figuren isa-viewsimilar to Figure 5 but showing the apparatus in extended position,

Figure 81is ak sectional view taken along.v line 8-8 i of Figure '7,4

Figure 9 is a fragmentary perspectiveview illustrating certain detailsof construction,

Figure is anenlarged fragmentary sectional viewl taken substantiallyyalong; line Ill--I of Figure 2,

Figurer 1.1i isf an enlarged' `fragmentaryv sectional viewy taken.lsubstantially along: line Iii- I I of- Fig.- ure 2.

Figure 112 is'an enlarged fragmentary sidefelevationa-l viewillustrating in details features of construction, and

Figure; 13` is a; fragmentary" side' elevational view illustrating f a`winch and: motorl forming Aa part of the invention;

Referring' moree particularly* to the drawings, there: is. show-nLtherein an embodiment; of, the invention: in. which there? is` providedthree-1 units; namely ai bottom. unit generally: indicated: at; Hf, aminterniediate` unit generally indicatedv at I:I and atop unitgenerallyindicated" at |22 Each of' the units isr generally:rectangularv in' shape when viewed. from above. or: below.

The bottom. orbase unit'` I0fis provided.: atleach corner with avertically extending' hollow cylindrical leg I3, the endilegsA ineaclfrcase being'interconnected at' their upper ends by an upper crossbar I4 and atw their lower endsby'a lower crossbar` I5; The legs I3ateitherside off' the unit If'Ilfare interconnectedv by-side-bars IGfwliicli extend inwardly therefrom and'A whichare com nected toffsideAplates Ifi-I in an adjustabieimanner; asy indicated atl I8`; The sideplates- I1 are interconnected byapair of spaced parallel sup'- portingbars I 9- from' which a' platform 291 is dependently supported byflegs2l. Adjustable-truss members' 22 interconnect theA plates' Ill and'C thelower'portions of each ofthe-legs I3 andbracket members 'Z3``interconnect the inner portions of each of the members I6 with theupper" portion of the adjacent legsl I3' to providey additional rigidityto the members |6 Eaclrof the cross barsl f4 has affixed.L thereto aninwardly extended U-shaped bracket 2# in which is revolubly mounted apulley 25". In the lower end of: each ofl the legs I3 there is mountedin the present form of the invention a caster- 26 for supportingtheentire appartus. However; it will bey apparent that theV basey unitI0 maybe mounted'upon a truck or` other'veliicle'or maybe provided withmeans oflccomotion inl itself;

The intermediate. unit. I'I is likewise provided with' a` verticallyextending hollow cylindrical' leg 21 at eachof its corners whichrlegsare telescopi cally mountedin each of the legs` I3 respectively andthelegs 21 at each end' of the unit II` are interconnected by a cross bar'2)8 adjacent the upper end thereof and each is provided with aninwardly extending horizontal side bar 29 whose inner ends arereceivable telescopically within a cylindrical member 30.

Vertically dependent from each of the bars 28 is a V-shaped bracket 3lin the lower or apex portion .of whichl is mounted a pulley 32.

Referring now to the top unit I2 there is likewise provided at eachcorner thereof a hollow cylindrical leg 33 which extends vertically andtelescopically into the leg 27 and the legs 33 at each of the shortersides of the unit I2 are interconnected adjacent their upper ends by across bar 34 and each of the legs 33 is provided with a horizontally andinwardly extending bar 35 which is telescopically receivable at itsinner endl in a hollow cylindrical member 36. To the outer side of eachof the cross bars 34 there is dependently and vertically mounted aV-shaped bracket 37 in the lower or apex portion of which there ismounted a pulley 38. 'I' Each of the cross bars 28 has afxed to theouter side thereof a U-shaped bracket 39 in which is revolubly mounted apulley 46. Upon the platform 20 there is mounted an electric motor 4|which is connected by means of a belt 42 with a pulley 43 affixed to oneside of a drum 44. The drum 44 has aiixed thereto a ratchet wheel 45with which a pawl 46 is engaged. The pawl 46 is revolubly mounted uponan ear 41 carried by one of the legs 2| and a compression spring 48 isinterposed between the pawl 46 and the leg 2| with which it isassociated.

' A cable is affixed, as indicated at 49, to the outer end of each ofthe brackets 24 and extends downwardly, as indicated at 50, whence it isentrained over the pulley 32 and thence extends upwardly over the pulley25 and thence to the drum or winch 44. Likewise to each of the brackets39 there is axed a cable 5I which extends downwardly and is entrainedover its associated pulley 36 and thence extends upwardly over thepulley 40 and thence to the winch 44.

In the upper ends of each of the pairs of end legs 33 there istelescopically mounted the legs 52 of a U-shaped fence member 53. Atvarious points about the apparatus the corner portions may beinterconnected by plates 54 or the like to provide additional rigidityto the apparatus.

In operation, it will be apparent that the de- `vice may be normally ina collapsed condition as shown, for example, in Figure and that when itis desired to raise the same to be used as a scaffold, it is onlynecessary to operate the motor 4I which operation may take place fromthe 11ppermost or top unit I2 by remote control and that when suchaction occurs the winch 44 will act to wind thereon the cables 50 and 5Ito thus raise the V-shaped brackets 3I and 37 and by the same token movethe legs 27 out of the legs I3 and at the same time the legs 33 out ofthe legs 21. As this action occurs, the pawl 46 will allow the teeth ofthe ratchet wheel 43 to pass thereby and thus it will be seen that asthe top unit I2 is raised to desired position, that the same willautomatically be locked in such position until it is desired to lowerthe apparatus which may be done in any suitable manner preferably byutilizing a brake in connection with the winch 44 in conventional mannerat which time, of course, the pawl 46 will be disengaged from theratchet wheel 43.

At one end of the apparatus there is provided a vertically dependentladder which is alxed 4 to the cross bar 34 and which ladder isindicated at 54a. A like ladder 55 is vertically dependent from thecross bar 28 and underlies the ladder 54a. A ladder 56 is formed as apart of the lower or base unit I 0 and consists of one of the legs I3together with a parallel interconnecting leg 57 and a plurality of rungs58 which interconnect the leg 57 with the adjacent leg I3. It will beseen that the ladder 54a extends slightly outwardly of the plane of theleg 33 while the ladder 55 extends slightly inwardly of the leg 21 tothus afford clearance of such ladders when the apparatus is collapsed.Likewise the ladder 56 is in the same plane as the legs I3 to furtheravoid any interference with the ladders 54a and 55 when the apparatus isin collapsed condition.

While but one form of the invention has been shown and described herein,it will be readily apparent to those skilled in the art that many minormodications may be made without departing from the spirit of theinvention or the scope of the appended claim.

What is claimed is:

An apparatus of the character described comprising a base unit, anintermediate unit, and a top unit, each of said units being generallyrectangular in plan view, and each being telescopically mounted in theunit next therebelow, means for simultaneously extending theintermediate and top units upwardly with `respect to the base unit, saidbase unit havingl a hollow cylindrical vertically extending leg in eachcorner thereof, said intermediate members having a hollow cylindricalvertically extending leg in each corner thereof and each verticallyslidable in a leg of the base unit, and said top unit having avertically extending leg in each corner thereof, each verticallyslidable in one of the legs of the intermediate unit, a cross barinterconnecting the upper end portions of each pair of legs at each endof each unit, a dependent V-shaped bracket aiiixed to the outer side ofeach cross bar of the top unit, a dependent V-shaped bracket aixed tothe inner side of each of the cross bars of the intermediate unit, apulley centrally mounted on the outer side of each cross bar of theintermediate unit, a pulley centrally mounted on the inner side of eachcross bar of the base unit, a pulley mounted at the lower end of eachV-shaped bracket, a winch mounted on the base unit, cables each aflixedat one end to each cross bar of the base unit and of the intermediateunit and each extending downwardly and entrained under the pulley on thebracket of the next uppermost unit and thence upwardly and over theadjacent pulley carried by the cross bar of its associated unit andthence extending to and connected with said winch.

References Cited in the le of this patent UNITED STATES PATENTS

